EP2685007B1 - Roue de fraisage pour une fraise pour paroi moulée - Google Patents

Description

The invention relates to a cutting wheel for a trench cutter according to the preamble of claim 1 and to a method for creating a trimming slot in a floor according to the preamble of claim 14.

The cutting wheel comprises a drum-shaped basic body, on the outer circumference of which fixed supports are arranged in at least one circumferential row, in which milling tools for removing soil are received.

For removing soil different milling tools are known. For the removal of softer earth and rock layers, such as sandy and cohesive soils and gravel, usually cutting teeth are used with one or more linear cutting edges. The soil is essentially loosened and removed by a cutting action of the cutting edges. In contrast, chisels with a substantially punctiform erosion tip are used for harder soil materials. The punctiform tip can break up hard material, causing it to peel off or peel off. Depending on the soil procurement differently equipped cutting wheels are used in the prior art.

However, it is common in earth boreholes that earth and rock layers of different hardness occur alternately. In this case, at each layer transition between a harder and a softer soil layer, the cutting wheels are replaced or fitted with a new set of milling tools. The trench wall cutter must therefore be lifted out of the created slot in a layer transition and lowered again after the change of the cutting wheels or milling tools in the slot. The replacement of the cutting wheels or milling tools is time consuming and costly.

EP 2 020 462 A2 shows a trench cutter with multiple cutting wheels, which are equipped with cutting teeth. The trench wall cutter is therefore particularly suitable for removing soft floors.

A equipped with chisels cutting wheel is in the EP 2 060 375 A1 described.

From the EP 1632 610 B1 goes out a cutting wheel, which is provided for mixing of soil material and suspension with mixing blades.

The invention has for its object to provide a cutting wheel and a method for creating a Frässchlitzes in a soil, which allow a particularly economical and fast creation of the slot.

The object is achieved by a cutting wheel with the features of claim 1 and a method having the features of claim 14. Preferred embodiments of the invention are specified in the respective dependent claims.

According to the invention, it is provided in the cutting wheel that, in the at least one circumferential row, milling tools with a substantially point-shaped removal tip as well as cutting teeth with a substantially linear cutting edge are arranged as milling tools.

In the method according to the invention, it is provided that a trench wall cutter with at least one cutting wheel formed in this way is introduced into the ground and the ground is removed by the milling tools.

A first basic idea of the invention can be seen in providing on the cutting wheel both milling tools for targeted removal of soft soil and milling tools for targeted removal of hard soil. The cutting wheel according to the invention is therefore suitable for milling through different soil layers, without the need to replace the milling tools in the transition between the soil layers. The chisels and the cutting teeth are stored in separate receptacles or holders.

By means of the chisel a point load is generated on the material to be removed, in particular hard material such as rock, which leads to a chipping or blasting off of the material. Soil removal is carried out by a breaking process. The cutting or milling teeth, however, are suitable for penetration into soft soil, so that a soil removal essentially takes place by means of a cutting process.

The chisels may in particular be round shank chisels which have a shank with a round cross section. The round shank bits can be rotatably mounted in a bit holder, which is preferably designed as a hollow cylindrical bore. Alternatively, the shank of the bit may also have a different cross-sectional shape, for example a polygonal cross-sectional shape.

A second basic idea of the invention is to arrange the milling tools, which are each adapted to a specific soil condition, in a common circumferential row or in a common circumferential line around the drum-shaped basic body. The holders for the chisels and for the cutting teeth of a circumferential row in this case preferably lie in a plane perpendicular to the axis of rotation of the cutting wheel. This is based on the knowledge that due to the specific designs of the bit and the cutting teeth excessive wear of the milling tools can be avoided if the bit and the cutting teeth are arranged in the direction of rotation of the cutting wheel behind the other, so cover substantially the same circular line. With a correct rotation of the cutting wheel, the chisels automatically perform a greater removal work on hard rock strata than the cutting teeth. On the other hand, in softer, especially cohesive soils, the cutting teeth take over a large part of the soil erosion. This can be with the cutting wheel according to the invention without replacing the milling cut through both hard and soft soil layers.

To minimize the wear of the cutting teeth during the milling of hard soil layers, it is preferred that a cutting tooth in a Abtragsdrehrichtung the cutting wheel at least one bit is disposed in such a way that the Scheidzahn is arranged in a Abtragsschatten the at least one bit.

Under a Abtragsschatten is to be understood in particular an area in the circumferential direction of the cutting wheel behind the chisel. The cutting tooth is therefore preferably arranged at the same axial height of the cutting wheel in the circumferential direction behind the bit, so that the cutting tooth moves off an already swept by the bit ring surface. For hard rock material, the stone is loosened by means of the chisel by breaking or knocking off the material. In this case, mostly over the punctiform Abtragsspitze beyond a large-scale removal of material by chipping off of the material. Due to the punctiform erosion point of the chisel, therefore, sufficient material is usually removed during rotation of the cutting wheel, so that the cutting tooth with the cutting edge does not or only slightly engages with the pending ground.

When milling through soft soil material, however, the punctiform erosion points of the chisel have only a small removal effect, since no break-off or break-off of the material can be produced. The soil removal is therefore largely due to the cutting teeth with the linear cutting edge, which penetrates into the ground.

To further reduce the wear of the cutting teeth when removing hard soil material, it is advantageous that a cutting tooth in a Abtragsdrehrichtung of the cutting wheel are preceded by a plurality of chisels, which are aligned at different angles of attack. The cutting edges of the cutting teeth preferably extend in an axial direction of the cutting wheel, so that a blade-like soil removal of soft soil material can take place. In contrast, the punctiform erosion tips of the chisel each only cover a comparatively narrow line. In order to reliably ensure as far as possible clearing of the surface swept by the cutting teeth in the case of hard soil material, the individual bits located in front of the respective cutting tooth are differently set or inclined in the axial direction, so that soil removal lines axially offset from one another by the individual bits are swept over.

It is also possible that the cutting tooth is set axially. In this case, the upstream bits are preferably adapted to the corresponding orientation of the angled cutting tooth.

A particularly reliable wear protection of the cutting tooth and an effective soil removal in hard rock is achieved in that in the at least one circumferential row of a group of chisels is formed from at least three bits, with a first bit largely aligned radially, a second bit in an axial direction of the Cutting wheel is angled sideways and a third bit in an opposite Axial direction is angled laterally. The chisels of the group are preferably arranged directly one after the other in the direction of rotation in front of a cutting tooth. Due to the different angles of the chisel, the removal area in the axial direction of the cutting wheel is increased and, in particular, a so-called full cut can be achieved, in which substantially the entire axial extent of the cutting wheel can be removed along the ground.

Another reliable reduction of the wear of the cutting teeth can be achieved in that a cutting tooth in a Abtragsdrehrichtung is at least one bit ahead, the Abtragsspitze of the bit relative to the cutting edge of the cutting tooth protrudes defined in the radial direction. The distance between the removal tip of the bit from the axis of rotation of the cutting wheel is thus greater than a maximum distance of the cutting edge of the cutting tooth from the axis of rotation. Thus, only the chisel with hard ground in engagement with the pending ground, while the cutting teeth are set back in contrast. On soft ground, however, the chisels only comb through narrow lines of the soil, while the main cutting work is taken over by the linear cutting edges of the cutting teeth that penetrate the soil.

The cutting teeth are preferably displaced radially back by an amount relative to the bits, which is in the range of a few millimeters to centimeters. Be particularly advantageous, an amount between 5 millimeters and 3 centimeters, in particular between 1 centimeter and 2.5 centimeters has been found.

In a preferred embodiment of the invention it is provided that on the outer circumference of the drum-shaped base body, a sheet metal ring is welded, in which the chisel and the cutting teeth of a circumferential row are arranged. The metal ring thus carries the different milling tools in the form of chisels and cutting teeth and ensures the arrangement of the cutting teeth and the chisel in a line or circumferential row around the main body of the cutting wheel. The sheet metal ring extends in a direction perpendicular to the axis of rotation of the cutting wheel level. It may be formed in one piece or from a plurality of sheet metal ring segments, and between individual sheet metal ring segments also free spaces or distances may be formed.

According to the invention, it is preferred that the sheet metal ring has radially open first recesses which are adapted to receive the chisel, and radially open second recesses which are adapted to receive the cutting teeth. Preferably, the first and second recesses are designed differently and tailored to the cutting teeth or the chisel. For example, the recesses for the cutting teeth may have a U-shape to receive cutting teeth with a U-shaped mounting portion. To accommodate the chisel or for so-called flat teeth can be provided in the circumferential direction inclined recesses. The recesses for the flat teeth are in this case preferably more inclined in the circumferential direction than the recesses for the chisel. The cutting teeth or the chisels can be attached either directly or with additional holders, adapters or sockets in the recesses of the sheet metal ring.

Preferably receiving bushes are used for releasably holding the chisel and / or the Scheidzähne in the sheet metal ring. The receiving bushes preferably have an insertion opening for receiving a shank of the milling tool. In particular for receiving round shank chisels or round shank teeth with a round attachment shank, the receiving shells can have round receiving openings. The receiving bushing can in particular provide a sliding bearing for a chisel in which a bearing shank of the chisel is rotatably mounted about its longitudinal axis extending through the ablation tip.

The receiving bushes preferably have a dome-shaped base surface for attachment in either different orientations on the sheet metal ring. For ejecting a milling tool received in the receiving bushing, an ejection opening can be formed on the receiving bush, which communicates with the receiving opening. About an ejector tool, the milling tool can be driven out of the receiving socket.

In particular for the provision of a full-cut milling wheel, it is preferred that the individual receiving bushes, in particular for the chisels, are arranged in different orientations in the sheet-metal ring. The different orientations may relate to axial and / or radial angles of attack. The receiving sockets are preferably releasably attached to the sheet metal ring. For example, the receiving sockets welded to the sheet metal ring or pressed into these, where they must be knocked out for replacement.

The flexibility of the cutting wheel can be further increased by arranging different types of cutting teeth in the at least one circumferential row. For example, cutting teeth for sandy soils and cutting teeth for cohesive soils can be used on the one hand. It is also conceivable to provide cutting teeth for gravel soils or softer rock layers.

On the outer circumference of the drum-shaped body is preferably formed a plurality of circumferential rows. For an effective cut through of hard rock layers, it is advantageous that exclusively chisels are arranged in at least one axially outer circumferential row, preferably in both axially outer circumferential rows. The chisels are preferably employed at least predominantly axially outward.

The cutting wheel is usually mounted on a trench cutter on a milling blade. In order to be able to mill off the area below the milling blade when sinking the trench wall cutter, it is preferred that at least one chisel and / or cutting tooth is arranged in a pivotally mounted holder in an axially outer circumferential row. The holder is mounted such that the chisel and / or cutting tooth can be pivoted inwards below the milling blade and can be pivoted inwards when passing the milling blade.

The invention also relates to a trench wall cutter for producing a milling slot in the ground, with a frame on which a plurality of cutting wheels are rotatably mounted in pairs. The cutting wheels are driven in rotation via a cutting wheel gear. Preferably located at a lower end of the trench wall cutter at least two pairs of cutting wheels, which are each arranged coaxially to each other. According to the invention, at least one cutting wheel, as described, is formed on the trench wall cutter.

In the method according to the invention for creating a milling slot in the ground, it is preferable for at least one soil layer with hard soil material, which is removed at least predominantly by the bit, to be located in a milling pond. and at least one soil layer with soft soil material is cut through, which is removed at least predominantly by means of the cutting teeth.

The drum-shaped main body of the cutting wheel in particular represents a hub of the cutting wheel. The hub is preferably designed sleeve-shaped and can be designed to receive a transmission.

In the course of operation of the trench wall cutter or the cutting wheel wear the milling tools. The cutting teeth and the bits are therefore preferably releasably secured in the holders of the cutting wheel.

Fig. 1:

eine perspektivische Ansicht eines erfindungsgemäßen Fräsrades;

Fig. 2:

eine seitliche Aussicht auf das Fräsrad;

Fig. 3:

eine Schlitzwandfräse, an welcher mehrere erfindungsgemäße Fräsräder angeordnet sind und

Fig. 4:

eine Schnittansicht eines erfindungsgemäßen Fräsrades im Bereich von Räumerplatten.

The invention is explained below with reference to the accompanying schematic drawings. Hereby shows:

Fig. 1:

a perspective view of a cutting wheel according to the invention;

Fig. 2:

a lateral view of the cutting wheel;

3:

a trench wall cutter on which a plurality of cutting wheels according to the invention are arranged and

4:

a sectional view of a cutting wheel according to the invention in the range of Räumerplatten.

In all figures, the same or equivalent components are identified by the same reference numerals.

The cutting wheel 10 shown in the figures comprises a drum-shaped main body 12, which forms a hub of the cutting wheel. On an outer, cylindrical circumferential surface 16 of the cutting wheel 10 a plurality of cutting tools in the form of chisels 40 and cutting teeth 50 are provided in several circumferential rows 14. In a circumferential row 14 are alternately chisel 40 and cutting teeth 50 are arranged.

The cutting wheel 10 comprises a plurality of fixed, ie immovable holders 30 for receiving and holding the milling tools. The brackets 30 are formed from sheet metal rings 20, in which receiving bushes 32 or bit holder can be used for receiving the milling tools. The chisel 40 and the Cutting teeth 50 are arranged in separate, independent recordings.

The annular outer circumferential surface of the cutting wheel 10 carries at predetermined intervals in the axial direction a plurality of metal rings 20 which extend in a direction perpendicular to the axis of rotation of the cutting wheel 10 level. The metal rings 20 extend radially and circumferentially about the cutting wheel 10 and may be constructed of individual sheet metal ring segments 22. Each individual sheet metal ring segment 22 can carry both chisel 40 and cutting teeth 50.

In the sheet metal ring 20 different, radially outwardly open recesses 24, 25, 26 are formed, in which the chisel 40 and the cutting teeth 50 can be firmly held.

In the illustrated embodiment, the chisels 40 are so-called round shank bits with a cylindrical attachment shank. The chisels 40 have a substantially point-shaped removal tip 42, which is arranged in a center axis of the chisel 40. The chisel 40 are inserted into the receiving bushes 32, which are designed approximately dome-shaped. The receiving bushes 32 have a receiving bore for receiving the attachment shaft. The bit 40 may be rotatably supported in the receiving bushes 32.

As cutting teeth 50 and milling teeth, the cutting wheel 10 comprises a plurality of flat teeth 54 with a linear cutting edge or cutting edge 52 for a large-scale soil removal. The cutting teeth 50 and flat teeth 54 are also received in receiving bushes 32. The cutting edge 52 is located at an axial end of the cutting tooth 50 and extends transversely to the orbit of the cutting tooth 50 about the axis of rotation of the cutting wheel 10. It is adapted to penetrate into soft soil material and ablate this over the length of the cutting edge 52. The flat teeth 54 comprise a shank, which is inserted into the receiving socket 32 and fixed therein. In addition, approximately horseshoe-shaped receptacles 26 are provided for further cutting or cutting teeth with linear cutting edges on the metal rings.

Each cutting tooth 50 are preceded by a plurality of chisels 40 in the direction of rotation of the cutting wheel 10. The cutting teeth 50 upstream chisel 40 are in different Anstellwinkeln attached to the sheet metal ring 20. For easier replacement of the chisel 40 in this case the corresponding receiving bushes 32 are mounted in different orientations fixed to the sheet metal ring 20 and the chisel 40 exchangeably received in the receiving bushes 32.

To produce a full cut of the cutting wheel 10, in a circumferential row 14, at least some of the bits 40 are set axially in a first direction and another bit 40 is set axially in an opposite direction. The chisels 40 located upstream of a cutting tooth 50 are adapted to the alignment of the cutting tooth 50. If the cutting tooth 50, for example, employed axially, so the upstream chisel 40 are employed axially in a corresponding manner.

To minimize the wear of the cutting teeth 50 when milling through hard rock, such as rock, the chisel 40 can protrude relative to the cutting teeth 50 in the radial direction by a defined amount.

On an axially inner side of the cutting wheel 10, which faces the milling blade, a plurality of chisels 40 are received on a pivotally mounted holder 36. By swiveling bracket 36 can be removed by swinging floor below a milling blade 4, while the chisel 40 can be pivoted for passing the milling blade in an upper area. At the outer circumferential rows 14a only chisel 40 are arranged, while at the inner peripheral rows 14b according to the invention in each circumferential row both chisel 40 and cutting teeth 50 are provided.

Fig. 3 shows a side view of a trench wall cutter according to the invention 1 with a plurality of cutting wheels 10, each with a horizontally oriented axis of rotation. In this embodiment, fixed cutting teeth 50 and pivotally mounted chisels 40 are disposed in the outer circumferential rows 14a. The trench wall cutter 1 comprises a frame 2, on which a plurality of cutting wheels 10 are rotatably mounted in pairs. The frame 2 comprises for storage of a pair of Fräsrad each a milling blade 4, which is arranged between each two cutting wheels 10 and carries the cutting wheels 10. Again Fig. 3 can be seen, the sheet metal ring 20 is formed in the illustrated embodiment of individual, spaced sheet metal ring segments 22. For supplying a support medium or a curable suspension in the Slot or for discharging the removed soil, a conveying line 6 is arranged, at the lower end of which an opening is formed.

Between the individual circumferential rows 14 of the cutting wheels 10 can scraper plates 60 engage, which are fixed to the frame 2 and derive soil from a gap 15 between the circumferential rows 14. Two scraper plates 60 for cleaning the area between each two adjacent peripheral rows 14 of milling tools are in Fig. 3 indicated schematically. The reamer plates 60 serve to remove, in particular, soft soil or clay material which may clog the area between the holding plates. In addition to the removal of the soil material, the reamer plates 60 may also be provided and arranged to shred high-promoted hard material, such as stones, from the milling tools. A reamer plate 60 has a baffle or baffle 68 for conducting the soil material. In addition, a crushing or crushing edge 70 is provided for crushing rock.

Fig. 4 shows a partially sectioned view of a section of a cutting wheel 10 along a plane parallel to the axis of rotation 11 of the cutting wheel 10 level. Milling tools in the form of chisels 40 are inter alia arranged on a radially outer region of the plate-shaped holders 30. As in Fig. 4 is shown, the chisel 40 may have a width which is greater than a width of the plate-shaped holders 30. The chisel 40 are thus in the axial direction of the cutting wheel 10 against the plate-shaped brackets 30 before. Between the chisels 40 and the lateral surface 16 of the drum-shaped main body 12, which can also be referred to as Fräsradtrommel, thus an undercut area 18 is formed. The undercut area 18 is bounded radially outward by the chisels 40.

In the intermediate space 15 between the circumferential rows 14 engages at least one reamer plate 60 which is fixed to the frame 2 of the trench wall cutter 1. The reamer plate 60 has a fixing portion 61 which is fixed to the frame 2. Furthermore, the reamer plate 60 includes a radially outer portion 62 between the milling tools and a radially inner free end 64 between two brackets 30th

At the free end 64 or at a radially inner region of the reamer plate 60, a projection 66 is formed, which projects into the undercut region 18 formed radially inside the milling tool. The projection 66 represents a widening of the reamer plate 60. The reamer plate 60 thus has a greater width at its free end 64 than at its radially outer region 62. More specifically, the reamer plate 60 has a greater width at its free end 64 than in FIG a region which extends between two milling tools.

The reamer plate 60 has an approximately triangular shaped cross-sectional area which projects between two circumferential rows 14 into two adjacent undercut areas 18. The triangular cross-sectional area extends radially outwardly from the free end 64 into an area between the milling tools. The width of the free end 64 of the reamer plate 60 substantially corresponds to the distance between two adjacent plate-shaped brackets 30, while the width of the radially outer portion 62 corresponds approximately to the distance between two milling tools adjacent peripheral rows 14.

The embodiment of a preferred chisel-shaped milling tool 40 will be described below with reference to FIG Fig. 4 described. The milling tool in the form of a bit 40, for example a round shank chisel, comprises a plurality of point-like removal tips 42, which are arranged annularly on a chisel head. Fig. 4 shows the chisel 40 in a lateral view in the direction of rotation of the cutting wheel 10. The axially outer Abtragsspitzen 42a are opposite the radial inclined more than the axially inner Abtragsspitzen 42b. In addition, the distance between the axially outer Abtragsspitzen 42 a in the axial direction is less than the distance between the axially inner Abtragsspitzen 42 b. This design of the milling tools, a particularly effective full section of a cutting wheel 10 can be generated. The more inclined, outer Abtragsspitzen 42a provide for effective flaking of soil 100, so that even in the area between two circumferential rows 14 through which the reamer plate 60 protrudes, soil 100 can be removed efficiently.

The removal of soil 100 by means of the illustrated milling tools is in the upper illustration of Fig. 4 indicated schematically. The inventively arranged Abtragsspitzen 42 cause at a designated rotation of the cutting wheel 10 in cross-section approximately trough-shaped Abtragsfläche.

The reamer plate 60 according to the invention reliably removes soil material from the undercut regions 18 between two circumferential rows 14 and thus increases the efficiency of the milling operation by preventing the interspaces 15 from being added between the circumferential rows 14. In particular, the projection 66 of the reamer plate provides a possibility for a cutting wheel with chisels 40 for removing hard soil material, in particular rock and rock layers, reliably remove soil material from the intermediate space 15 between the holding plates 30. The reamer plate 60 is particularly suitable for use in cutting wheels with different milling tools, for example, both teeth with linear cutting edge and chisels with punctiform Abtragsspitze.

The trench wall cutter according to the invention and the cutting wheel according to the invention enable a particularly efficient and economic creation of a trimming slot, in particular in the milling through of different hard soil layers. The cutting wheel according to the invention represents a multi-function wheel.

Claims (15)

1. Cutting wheel for a trench cutter (1) having a drum-like base body (12), on the outer periphery of which stationary holders (30) are arranged in at least one peripheral row (14), in which holders (30) cutting tools are received for removing ground,
   characterised in that
   in the at least one peripheral row (14) both chisels (40) with a substantially pointed removal tip (42) and also cutting teeth (50) with a substantially linear cutting edge (52) are arranged as cutting tools.
2. Cutting wheel according to claim 1,
   characterised in that
   at least one chisel (40) is arranged upstream of a cutting tooth (50) in a removal rotation direction of the cutting wheel (10) in such a way that the cutting tooth (50) is disposed in a removal shadow of the at least one chisel (40).
3. Cutting wheel according to claim 1 or 2,
   characterised in that
   a plurality of chisels (40) are arranged upstream of a cutting tooth (50) in a removal rotation direction, said chisels (40) being orientated at different attack angles.
4. Cutting wheel according to one of the claims 1 to 3,
   characterised in that
   a group of chisels (40) comprising at least three chisels (40a, 40b 40c) is formed in the at least one peripheral row (14), wherein a first chisel (40a) is radially orientated, a second chisel (40b) is angled laterally in an axial direction of the cutting wheel (10) and a third chisel (40c) is angled laterally in a contrary axial direction.
5. Cutting wheel according to one of the claims 1 to 4,
   characterised in that
   at least one chisel (40) is arranged upstream of a cutting tooth (50) in a removal rotation direction, wherein the removal tip (42) of the chisel (40) projects in a defined manner in radial direction in relation to the cutting edge (52) of the cutting tooth (50).
6. Cutting wheel according to one of the claims 1 to 5,
   characterised in that
   a sheet metal ring (20) is welded to the outer periphery of the drum-like base body (12), in which sheet metal ring (20) the chisels (40) and the cutting teeth (50) of a peripheral row (14) are arranged.
7. Cutting wheel according to claim 6,
   characterised in that
   the sheet metal ring (20) comprises radially open first recesses (24) which are adapted to receive the chisels (40) and radially open second recesses (25) which are adapted to receive the cutting teeth (50).
8. Cutting wheel according to claim 6 or 7,
   characterised in that
   receiving sockets (32) are inserted into the sheet metal ring (20) for releasable holding of the chisels (40) and / or the cutting teeth (50).
9. Cutting wheel according to claim 8,
   characterised in that
   the individual receiving sockets (32) are arranged in different orientations in the sheet metal ring (20).
10. Cutting wheel according to one of the claims 1 to 9,
    characterised in that
    different types of cutting teeth (50) are arranged in the at least one peripheral row (14).
11. Cutting wheel according to one of the claims 1 to 10,
    characterised in that
    a plurality of peripheral rows (14) are formed on the outer periphery of the drum-like base body (12), and
    in that exclusively chisels (40) are arranged in at least one axially outer peripheral row (14a).
12. Cutting wheel according to one of the claims 1 to 11,
    characterised in that
    at least one chisel (40) and/or cutting tooth (50) is/are arranged in a pivotably mounted holder (36) in an axially outer peripheral row (14a).
13. Trench cutter for producing a cut trench in the ground, with a frame (2), on which a plurality of cutting wheels (10) are rotatably mounted in pairs,
    characterised in that
    at least one cutting wheel (10) is formed according to one of the claims 1 to 12.
14. Method for making a trench in the ground,
    characterised in that
    a trench cutter (1) is incorporated according to claim 13 into the ground and the ground is removed through cutting tools.
15. Method according to claim 14,
    characterised in that
    in one cutting stage at least one ground layer with hard ground material which is removed at least predominantly by the chisels (40) and at least one ground layer with soft ground material is milled through, which is removed at least predominantly by means of the cutting teeth (50).

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